134 lines
4.3 KiB
C#
134 lines
4.3 KiB
C#
/*
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KeePass Password Safe - The Open-Source Password Manager
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Copyright (C) 2003-2025 Dominik Reichl <dominik.reichl@t-online.de>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Text;
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using KeePassLib.Utility;
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namespace KeePassLib.Cryptography
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{
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public static class PopularPasswords
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{
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private static readonly Dictionary<int, Dictionary<char[], bool>> g_dicts =
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new Dictionary<int, Dictionary<char[], bool>>();
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internal static int MaxLength
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{
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get
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{
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Debug.Assert(g_dicts.Count > 0); // Should be initialized
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int iMaxLen = 0;
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foreach (int iLen in g_dicts.Keys)
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{
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if (iLen > iMaxLen) iMaxLen = iLen;
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}
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return iMaxLen;
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}
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}
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internal static bool ContainsLength(int nLength)
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{
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Dictionary<char[], bool> dDummy;
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return g_dicts.TryGetValue(nLength, out dDummy);
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}
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public static bool IsPopularPassword(char[] vPassword)
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{
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ulong uDummy;
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return IsPopularPassword(vPassword, out uDummy);
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}
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public static bool IsPopularPassword(char[] vPassword, out ulong uDictSize)
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{
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if (vPassword == null) throw new ArgumentNullException("vPassword");
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if (vPassword.Length == 0) { uDictSize = 0; return false; }
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#if DEBUG
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Array.ForEach(vPassword, ch => Debug.Assert(ch == char.ToLower(ch)));
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#endif
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try { return IsPopularPasswordPriv(vPassword, out uDictSize); }
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catch (Exception) { Debug.Assert(false); }
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uDictSize = 0;
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return false;
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}
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private static bool IsPopularPasswordPriv(char[] vPassword, out ulong uDictSize)
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{
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Debug.Assert(g_dicts.Count > 0); // Should be initialized with data
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Dictionary<char[], bool> d;
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if (!g_dicts.TryGetValue(vPassword.Length, out d))
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{
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uDictSize = 0;
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return false;
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}
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uDictSize = (ulong)d.Count;
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return d.ContainsKey(vPassword);
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}
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public static void Add(byte[] pbData, bool bGZipped)
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{
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try
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{
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if (bGZipped)
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pbData = MemUtil.Decompress(pbData);
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string strData = StrUtil.Utf8.GetString(pbData, 0, pbData.Length);
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if (string.IsNullOrEmpty(strData)) { Debug.Assert(false); return; }
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StringBuilder sb = new StringBuilder();
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for (int i = 0; i <= strData.Length; ++i)
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{
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char ch = ((i == strData.Length) ? ' ' : strData[i]);
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if (char.IsWhiteSpace(ch))
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{
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int cc = sb.Length;
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if (cc > 0)
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{
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char[] vWord = new char[cc];
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sb.CopyTo(0, vWord, 0, cc);
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Dictionary<char[], bool> d;
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if (!g_dicts.TryGetValue(cc, out d))
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{
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d = new Dictionary<char[], bool>(MemUtil.ArrayHelperExOfChar);
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g_dicts[cc] = d;
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}
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d[vWord] = true;
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sb.Remove(0, cc);
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}
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}
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else sb.Append(char.ToLower(ch));
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}
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}
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catch (Exception) { Debug.Assert(false); }
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}
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}
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}
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